Planning a solo trip this summer? Before you go it alone, do your homework and research all you can for your own safety. Recently, and just in time for the busy summer travel season, the U.S. State Department updated a number of its travel advisories on its website.

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If you’ve never reviewed them before (and you should), the department gives each country a rating based on one of the four following advisory levels:

Level one: Exercise normal precautions

Level two: Exercise increased precautions

Level three: Reconsider travel

Level four: Do not travel

The State Department bases its ratings using available public information on local crime, terrorist activity, civil unrest, health, and natural disasters/weather—meaning it’s a good measure to check before visiting a place you might be unfamiliar with.

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At a minimum, they update level one and two advisories every year and countries with level three and four advisories every six months, though they often update more frequently based on ongoing events. If you’re planning a trip, here are the current standings for countries with advisories above level two that you might want to consider. (And given current events, some countries listed might be more obvious than others.)

Level four

Of course, there’s an inherent flaw to the advisory system in that there are always regional differences in some countries. (The State Department recently did away with regional alerts. For this reason, you should visit their website to check a country’s advisory; you might find information about local risks available there.) That said, you should still carefully consider any travel plans to a destination with a major advisory.

If you want to stay safe abroad, always enroll in the State Department’s Smart Traveler Enrollment Program or STEP; you’ll receive updated travel alerts and have resources in the event of an emergency.

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Also, it’s always helpful to contact a local U.S. embassy or consulate at your destination which can also provide you with any information or resources you might need during a trip.